EP0129760B1 - Spurfolgesystem mit einem optischen Abtaster für ein Audio- oder Video-Plattenwiedergabegerät - Google Patents

Spurfolgesystem mit einem optischen Abtaster für ein Audio- oder Video-Plattenwiedergabegerät Download PDF

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Publication number
EP0129760B1
EP0129760B1 EP84106633A EP84106633A EP0129760B1 EP 0129760 B1 EP0129760 B1 EP 0129760B1 EP 84106633 A EP84106633 A EP 84106633A EP 84106633 A EP84106633 A EP 84106633A EP 0129760 B1 EP0129760 B1 EP 0129760B1
Authority
EP
European Patent Office
Prior art keywords
track
phase grating
signal
spots
scanning
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP84106633A
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German (de)
English (en)
French (fr)
Other versions
EP0129760A1 (de
Inventor
Hans-Robert Kühn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Deutsche Thomson Brandt GmbH
Original Assignee
Deutsche Thomson Brandt GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Deutsche Thomson Brandt GmbH filed Critical Deutsche Thomson Brandt GmbH
Priority to AT84106633T priority Critical patent/ATE30647T1/de
Publication of EP0129760A1 publication Critical patent/EP0129760A1/de
Application granted granted Critical
Publication of EP0129760B1 publication Critical patent/EP0129760B1/de
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0925—Electromechanical actuators for lens positioning
    • G11B7/0929—Electromechanical actuators for lens positioning for tracking only
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0901—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following only
    • G11B7/0903—Multi-beam tracking systems
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0925—Electromechanical actuators for lens positioning
    • G11B7/0937—Piezoelectric actuators

Definitions

  • the present invention relates to a radially acting tracking system with an optical scanner for an audio or video disc player.
  • auxiliary light spots arranged in the tangential direction to the track. They lie at the same distance from the main light spot, their center points on a line and they are offset in the radial direction so that they are opposite to the center of the track so that if the track radially deviates under the light spots, opposite effects arise in the two auxiliary light spots.
  • the reflected light intensities of the two auxiliary light spots are read out separately from one another and separately from the reflected light intensity of the main light spot via corresponding detection means.
  • phase pattern diffrradiation grating
  • EP-OS-00 73 066 also shows a similar adjustability.
  • an optical scanner constructed according to the multiple three-beam principle this is mentioned (FIG. 5 and the associated description)
  • the aim is to adjust the angles (0, and 0 2 ) of the two three-beam systems.
  • the angle between the line on which the three light spots lie and the tangent at the track scanning point can also be adjusted, namely during the scanning.
  • EP-A2-00 89 736 (Art. 54 (3) document, publication date September 28, 1983) proposed a solution in which a phase raster (22) is excited in such a way by means of a piezoelectric crystal (42) that that the central main light spot (36) is said not to be influenced and the outer auxiliary light spots (32, 40) vibrate radially and in the opposite direction at 20 to 30 kHz.
  • the movement of the phase grid is provided here around an outer support point (23) (FIG. 1). This base point (23) is not on the central axis of the phase grid (22) and thus not in the center of the main light beam.
  • the invention is therefore based on the object of constructing an optical scanner constructed according to the three-beam principle, which can also be used well with radial swivel arms and enables an excellent automatic adjustment of the fine-tracking control to the current track curvature.
  • a phase grid controllable around its center is used in connection with a radially acting tracking system. This can cause undesired angular deviations of the two auxiliary light spots from the track direction to be corrected.
  • a control signal fed into the controllable phase grid is used, the main light spot does not experience any change in its position in the radial direction, i.e. the control signal is not superimposed on the sampled information signals.
  • An arbitrarily high, suitable frequency can therefore now be used, with the mentioned advantage of a sufficiently large frequency spacing compared to the actual radial error signal.
  • the phase grid is controlled by means of electrodynamically or piezoelectrically operating drive means in such a way that, by corresponding angular rotations around the center of the phase grid in a plane perpendicular to the light beam, the two auxiliary light spots with low amplitude oscillate around the center of the main light spot. From the mapping of this movement of the auxiliary light spots relative to the track, a track deviation as well as any optical asymmetry in the radial direction can be detected in a known manner and converted into radial correction control signals. With an additional device for the control of the phase grid, it is possible to take into account known angular deviations due to design-related tolerances of the auxiliary light spots. For this purpose, a conventional D / A converter, the output signals of which supply the control variable for the drive means of the phase grid, is preceded by a ROM (read only memory).
  • ROM read only memory
  • Such angular deviations exist, for example, when there is a dependency of the tangent error angle on the scanning radius on the basis of the geometric design conditions and that in the "normal scanning" operating mode as well as in the "search run” operating mode from the assignment of the known angular errors from the scanning radius via the to the Plates available information of the cumulative play time is calculated and used as an address, e.g. B. consisting of 8 individual bits each, can be used for the ROM. In this way, incorrect scans can be avoided, the cause of which lies in known angular deviations.
  • an address e.g. B. consisting of 8 individual bits each
  • Figure 1 shows a track section of two adjacent tracks.
  • the track Sp2 just scanned by the main light spot H is the lower of the two here.
  • the radial direction perpendicular to the tracks is marked with RR. in the Distance a, the two auxiliary light spots A and B are shown offset from the main light spot H opposite to the track in the radial direction.
  • the sizes D and D 2 appear , z. B. by rotating the phase pattern Ph ( Figure 2) around its center and are undesirable. With swivel arm scanning, however, they cannot be avoided. They also occur with radial-linear scanning due to design-related tolerances.
  • the phase pattern Ph can only be optimally set for one track radius.
  • FIG. 3 shows graphically how this affects the resulting angle of error 8 at different light spot distances a.
  • FIG. 2 shows the basic beam path when using a phase raster Ph to generate the two auxiliary light spots A and B.
  • a light bundle runs from the light source Q, for example a laser diode, to the phase raster Ph.
  • Three partial light bundles are formed there in accordance with the diffraction phenomena and are directed to the mirror 1 by means of a collecting lens S 1 , via a semi-transparent mirror 2.
  • the bundles of rays reflected there are each focused by a further converging lens S 2 in the plane of the reflection layer R and give the light spots A, H and B.
  • the reflected light bundles of these light spots return in the same way to the semi-transparent mirror 2, which they to the detection elements for these light beams Det.H, Det.A and Det.B reflected.
  • the error angle 8 (FIG. 3) arises from the sum of the tolerances of one of the scanning systems mentioned.
  • the essential concept of the invention is shown schematically in FIG.
  • a light source Q for example a laser diode
  • three light bundles are created due to the diffraction phenomena, namely in one plane.
  • the three light bundles land on the disc-shaped information carrier to be scanned.
  • the three spots of light are centered on a straight line.
  • Rotating the phase grid Ph by an angle a around its center Z causes an angle deviation a 'of this straight line to the track direction Sp.
  • the correct position of the light spots in relation to the information track is shown in FIG. 5.
  • a drive means which is driven by a control variable formed from the detection, so as to adjust its center Z by the angle a that the Angular deviation and thus the amount D of the deviation is regulated to zero.
  • the main light spot H remains stationary on the information track.
  • FIGS. 6a and 6b show an exemplary embodiment of a drive means for the phase grid Ph.
  • the phase grid plate Ph is rotatably mounted between two bearings 10, 11 fixed to the housing. It is fastened in a radially magnetized magnetic ring 12 which is rotatable between the bearings 10, 11 and which is driven or controlled by two coils 13, 14 fixed to the housing via air gaps by inductive action on the poles thereof.
  • the control voltage applied to the coils 13, 14, which is composed of the control signal and the control variable derived from the detection means, causes a torque, as a result of which the magnetic ring 12 together with the phase pattern Ph is moved accordingly.
  • the light source Q for example a semiconductor laser, is attached centrally near the other end.
  • FIGS. 7 and 8 show two other exemplary embodiments for the drive means in perspective and partially cut away.
  • FIG. 7 shows an electrodynamic drive 5 for the phase grid Ph and storage close to the axis.
  • the light source Q and a deflecting mirror U which, depending on the remaining design of the optical scanner, can also be designed as a partially transmissive beam splitter, in which case the reflected light is separated from the emitted light, similar to FIG. 2, are located in front of and behind the phase grid Ph on a stationary holder 6 within the driven swivel device with the frame 9.
  • the axes 8 and 8a on both sides are rotatably supported in a manner not shown.
  • Figure 8 shows a similar structure and corresponding representation with a piezoelectric torsion transducer 7 as the drive means.
  • FIG. 9 shows in a simplified manner how the detection signals A and B are evaluated and the control signal S for driving the phase grid is determined therefrom. There is a reference signal at the minus input of the differential amplifier
  • FIG. 10 shows graphically how the control signal Ua runs as a function of time t over a period T and below it the corresponding time course of the detection signals A and B without an error angle a ', the detection elements not being shown. (Fig. 10a).
  • the control signal appears in the same phase to one another on the two detection elements.
  • the signal generated in the detection element A is delayed by half the period of the control signal Ua and added to the signal generated in the detection element B and then subtracted from a reference voltage C in a differential amplifier.
  • FIG. 11 shows a simple block diagram for an additional device.
  • a ROM is connected upstream of the usual D / A converter which emits the control signal for the phase pattern Ph. It has variables X assigned to it via its inputs, which is the ROM address which results from the calculation of the "jump address".
  • angular deviations are z. B. before when there is a dependency of the tangent error angle on the scanning radius due to the geometric design conditions and the both with normal scanning as well as in the operating mode "search" from the "jump distance" z. B. is calculated in the form of tracks to be skipped, the number of tracks to be skipped taking into account the already scanned tracks, consisting of, for example, eight individual bits, are used as the address for the ROM.
  • the tracks that have already been scanned or completed are the number of tracks that are determined in the radial direction from the beginning of the track area of the disk to the current scanning point. In the case of currently known playback devices, the determination of this number is calculated from the accumulated time and is therefore already available.

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  • Optical Recording Or Reproduction (AREA)
EP84106633A 1983-06-25 1984-06-09 Spurfolgesystem mit einem optischen Abtaster für ein Audio- oder Video-Plattenwiedergabegerät Expired EP0129760B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84106633T ATE30647T1 (de) 1983-06-25 1984-06-09 Spurfolgesystem mit einem optischen abtaster fuer ein audio- oder video-plattenwiedergabegeraet.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3323007A DE3323007C1 (de) 1983-06-25 1983-06-25 Spurfolgesystem mit einem optischen Abtaster für ein Audio- oder Video-Plattenwiedergabegerät
DE3323007 1983-06-25

Publications (2)

Publication Number Publication Date
EP0129760A1 EP0129760A1 (de) 1985-01-02
EP0129760B1 true EP0129760B1 (de) 1987-11-04

Family

ID=6202447

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84106633A Expired EP0129760B1 (de) 1983-06-25 1984-06-09 Spurfolgesystem mit einem optischen Abtaster für ein Audio- oder Video-Plattenwiedergabegerät

Country Status (6)

Country Link
US (1) US4686663A (enrdf_load_stackoverflow)
EP (1) EP0129760B1 (enrdf_load_stackoverflow)
JP (1) JPS6052937A (enrdf_load_stackoverflow)
AT (1) ATE30647T1 (enrdf_load_stackoverflow)
DE (1) DE3323007C1 (enrdf_load_stackoverflow)
DK (1) DK155256C (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12168194B2 (en) 2014-12-27 2024-12-17 Donaldson Company, Inc. Filter cartridges; air cleaner assemblies; housings; features; components; and, methods

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CA1277767C (en) * 1986-03-19 1990-12-11 Kenji Torazawa Optical recording apparatus
HU196518B (en) * 1986-12-22 1988-11-28 Itex Kutato Fejlesztoe Termelo Method and apparatus for the transformation and formation of laser beam
DE3804701A1 (de) * 1987-03-20 1988-09-29 Hitachi Ltd Mehrfachlichtfleck-lageregeleinrichtung
JPH0538411Y2 (enrdf_load_stackoverflow) * 1987-05-11 1993-09-29
US5224082A (en) * 1988-02-26 1993-06-29 Fujitsu Limited Method for detecting tracking error in optical disk system and its optical system devices thereof
JPH01256031A (ja) * 1988-04-04 1989-10-12 Nippon Telegr & Teleph Corp <Ntt> 光ディスクのトラッキング方法
JP2583273B2 (ja) * 1988-04-04 1997-02-19 株式会社日本コンラックス 光学的情報記録再生方法および装置
JPH0322227A (ja) * 1989-06-19 1991-01-30 Matsushita Electric Ind Co Ltd 光ディスク装置
JPH03100931A (ja) * 1989-09-14 1991-04-25 Mitsubishi Electric Corp 光学式情報記録再生装置
US5412640A (en) * 1990-09-10 1995-05-02 Deutsche Thomson-Brandt Gmbh Method for measuring and regulating the radial and tangential angles of a light beam
US5146242A (en) * 1991-03-15 1992-09-08 Eastman Kodak Company Writing beam angular alignment device
JPH07192287A (ja) * 1993-12-27 1995-07-28 Pioneer Electron Corp 光ピックアップ装置
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US5523993A (en) * 1995-05-17 1996-06-04 Opto-Electronics & Systems Laboratories Holographic optical element for optical disk pickup head
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DE69715960T2 (de) * 1996-05-15 2003-01-30 Matsushita Electric Industrial Co., Ltd. Herstellungsverfahren eines Vliesstoffsubstrats für Leiterplattensubstrat und Herstellungsverfahren eines vorimpregnierten Materials
EP1581939A1 (en) * 2002-12-30 2005-10-05 Koninklijke Philips Electronics N.V. Optical scanning device
KR100604014B1 (ko) 2004-06-21 2006-07-24 엘지전자 주식회사 홀로그래픽 데이터 저장 시스템
US20080094947A1 (en) * 2004-07-21 2008-04-24 Koninklijke Philips Electronics, N.V. Optical Disc Device for Recording and Reproducing
KR20080021052A (ko) * 2005-05-31 2008-03-06 코닌클리케 필립스 일렉트로닉스 엔.브이. 광학계
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JPS6048809B2 (ja) * 1979-10-16 1985-10-29 パイオニアビデオ株式会社 情報読取装置におけるトラッキングサ−ボ引込装置
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12168194B2 (en) 2014-12-27 2024-12-17 Donaldson Company, Inc. Filter cartridges; air cleaner assemblies; housings; features; components; and, methods

Also Published As

Publication number Publication date
DK309884D0 (da) 1984-06-25
JPH0434213B2 (enrdf_load_stackoverflow) 1992-06-05
JPS6052937A (ja) 1985-03-26
ATE30647T1 (de) 1987-11-15
DK155256B (da) 1989-03-13
DK309884A (da) 1984-12-26
DE3323007C1 (de) 1984-06-28
DK155256C (da) 1989-07-31
US4686663A (en) 1987-08-11
EP0129760A1 (de) 1985-01-02

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